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View Code? Open in Web Editor NEWmysql 이것저것 실험
mysql 이것저것 실험
인덱스를 활용할 수 있는 쿼리라도 컬럼의 값 처리가 필요한 함수를 사용하면
검색 전에 값 처리를 진행하기 때문에 인덱스가 있다고 하더라도 사용에 어려움이 있다.
order by를 사용할 때 인덱스를 활용하는 법에 대해서 기술한다.
인덱스를 구성해도 첫 검색 조건에 첫 인덱스 컬럼이 포함되지 않으면 인덱스를 사용할 수 없다.
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